Equipped with EMI's performance Stainless Steel High Flow Risers, these are EMI's best performing systems. They are a direct replacement for stock Mercruiser manifolds in Bravo and Alpha applications where the exhaust outlets exit through the transom in the stock location. The 16” long riser is a must with High Performance camshafts to prevent reversion (water ingestion). Becuase of their added length, these will NOT work with Selector systems or stock “S” pipe connections. Brackets to keep all of the stock components in their existing locations (shift quadrant, ignition module and oil filter bracket) are included in this kit. Complete systems come with all necessary bolts, gaskets and fittings. Standard with black Fusioncoated finish- optional finishes are available. Specify the correct accessory brackets and options when ordering.